package dao;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.NotUpdatable;
import com.mysql.jdbc.PreparedStatement;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class BlogDao {
    //新增一个博客
    public void insert(Blog blog){
        Connection connection = null;
        PreparedStatement statement = null;

        connection = DBUtil.getConnection();
        String sql = "insert into blog values (null,? ,? ,?,now())";
        try {
            statement = (PreparedStatement) connection.prepareStatement(sql);
            statement.setString(1,blog.getTitle());
            statement.setString(2,blog.getContent());
            statement.setInt(3,blog.getUserId());
            statement.executeUpdate();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            DBUtil.close(connection,statement,null);
        }
    }

    //查询所有博客
    public List<Blog> getBlogs(){
        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        List<Blog> blogList = new ArrayList<>();

        connection = DBUtil.getConnection();
        String sql = "select * from blog order by postTime desc";
        try {
            statement = (PreparedStatement) connection.prepareStatement(sql);
            resultSet = statement.executeQuery();
            while (resultSet.next()){
                Blog blog = new Blog();
                blog.setBlogId(resultSet.getInt("blogId"));
                blog.setTitle(resultSet.getString("title"));
                blog.setContent(resultSet.getString("content"));
                blog.setUserId(resultSet.getInt("userId"));
                blog.setPostTime(resultSet.getTimestamp("postTime"));
                blogList.add(blog);
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            DBUtil.close(connection,statement,resultSet);
        }
        return blogList;
    }
    //指定博客id查询某一个博客
    public Blog getBlog(int blogId){
        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            connection = DBUtil.getConnection();
            String sql = "select * from blog where blogId = ?";
            statement = (PreparedStatement) connection.prepareStatement(sql);
            statement.setInt(1,blogId);
            resultSet = statement.executeQuery();
            if(resultSet.next()){
                Blog blog = new Blog();
                blog.setBlogId(resultSet.getInt("blogId"));
                blog.setTitle(resultSet.getString("title"));
                blog.setContent(resultSet.getString("content"));
                blog.setUserId(resultSet.getInt("userId"));
                blog.setPostTime(resultSet.getTimestamp("postTime"));
                return blog;
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            DBUtil.close(connection,statement,resultSet);
        }
        return null;
    }
    //指定博客进行删除
    public void delete(int blogId){
        Connection connection = null;
        PreparedStatement statement = null;

        try {
            connection = DBUtil.getConnection();
            String sql = "delete from blog where blogId = ?";
            statement = (PreparedStatement) connection.prepareStatement(sql);
            statement.setInt(1,blogId);
            statement.executeUpdate();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            DBUtil.close(connection,statement,null);
        }
    }
}
